Cutter-chain.



R. E. NOBLE. CUTTER CHAIN. APPLIOATIONIILED 001*. 14,1907.

Patented May 18, 1909.

UNITED sTAfrns PATENT curios.

RALPH E. NOBLE, OF CHICAGO, ILLINOIS, ASSIGN OR TO MORGAN-GARDNER ELECTRIC 7 COMPANY, OF CHICAGO, ILLINOIS.

CUTTER-CHAIN.

Specification of Letters Patent.

Application filed October 14, 1907. Serial No. 397,348. v

; Patented May 18', 1 909.

the chains and bits used in mining machines for cutting coal or the like, and its objects are particularly to provide a novel form of to thicken the metal or cause'it along the sides of the bit adjacent to the cut- .bit which will-obviate certain disadvantages ,in the bits heretofore used, which will be easily and economically constructed, and which will be eii'ective in o eration; and to combine said bit with a suita le link forholding the same, said link also containing certain improvements which will be pointed out hereinafter. 1 7 v,

I have illustrated my invention in the adcompanying drawings, in which: .1

Figure 1 represents a side-view of a link provided with .a pick-point bit embodying this invention; Fig. 2 -IS an end-view. of the same; Fig. 3 is an end-view of the bit shown in Figs. 1 and 2; Fig. his in end-view of a chisel bit also embodying certain features of this invention Fig. 5 is a side-view of the chisel bit, and Fig. 6 is a cross-section ofthe bit-shank. p y

' Heretofore, mining machine bits have generally been made from stockof square or rectangular cross-section; but when such bits are forged or bent up to form apoint, as shown in the drawings,.there is a tendency to bulge" out ting point or edge, and when in operation,

- these bulged sides will frequently bear against the wall which is being cut, to such an extent as to spring the bits or links, or to otherwise injure the cutting chain. In order to avoid this objection and to furnish sufficient clearance in cutting, I have devised the bit-shown in the drawings, which not only has these advantages, but is stronger than the ordinary rectangular bit and requires less labor in shar ening.

As shown int e drawings, 7 represents a pickoint bit having a body or shank portion ormed with two parallel faces 8 and 9 as indicated in-Fig. 6, and with rearwardly inclined or'converging sides 10 so arranged that the widest face 8 will be toward the front body furthermore assists in holding the bit firmly in posit-ion in the socket L2 in the link bit, therefore, when pressure is exerted on the cutting oint, therewill be a tendency to wedge the it firmly in the socket. socket 12 is provided at one end with apin 14 to revent the shank of the bit force too far through the link, and the bitis further held in position by means of a setscrew 15. Y The socket in the link 13 may of course be arranged so that the bits will project laterally in a plane passing through the center of the link, or obliquely thereto, as shown in the drawings. When the bit is arranged obliquely, I have found it preferable to have the point of the bit extend beyond theouter side 16 of the lug 1? which projects 'from the body of the link 13 to form a longer bearing for the bit and to receive the setscrew 15. The side 16 is also curved so that it will not engage with, or rub against the wall of the kerf cut by the chain.

Figs. 4 and 5 'show a chisel-pointed bit when made from the same stock or with the same form of body as the bit above described, and this bit also. has the advantages arising from being made from the tapered stock or with a tapered body. As shown in Fig. 4, it will be noted that the sides 18 adjacent to the cutting-edge 19'of the bit 20, recede from such edge so that there will be no tendency toward. rubbing on the kerf; consequently, the bit will out a clear, sharp. channel, with the least amount of power and without unnecessary friction on the walls and Withoutinjury to the cutter-chain. other changes in the exact shape or form of the bits may suggest themselves as coming within the scope-of this invention, and there- 13, this socket being preferably formed to. correspond in shape with the-shank of thefrom being.

The

n will be noted that. 1

fore I do not wishto be limited to the exact 1. A bit for mining machines, having a cutting 'portion curved outwardly and forg said bit, and means for holding said bit in Wardly from thebodyportion,said body por position in said link. tionbeing tapered back from the'front or 1 3. A pick-point bit for mining machine cutting face and the cutting portion also i chains, comprising a-bar of metalhaving parconverging backwardly from the cutting 'allel faces and rearwardly converging sides; face.- y g and having one end curved forwardly to form 2. In a cutter chain for mining machines, a relatively sharp cutting point, the sides the combination of a bit tapered to form a also converging backwardly from said cutcutting portion, this tapered portion of the 1 bit beingbentforwardly outofalinementwith cutting portion of the bit. the main body of the bit, said bit being tapered backwardly in cross-section whereby the body of the bit recedes or narrows back Witnesses: from the cutting 'face, a chain link having a l C. HEYMANN, hole therein to receivethe body portion of l L. LANG.

ting point in order togive clearance for the RALPH E. NOBLE. 

